Glue applying roller



sept. 1, 1942.

E. o. PEARsoN GLUE APPLYING ROLLER Filed June l5, 1940 Mmm om Wo um om m:

,ELME/e 0. Pin/afan Patented Sept. l, 1942 Elmer 0. Pearson, Seattle, Wash., assignor to n -Frank Fluckinger, Seattle, Wash.

Application June 15, 1940, Serial No. 340,711.

' e claims. (c1. sia-'49)' This inventionrelates to glue applying machines, and has reference more particularly to r improvements in gluevspreading. rollers as used in'such machines as those employed in the4 manufacture of plywood panels; the invention dealing especiallywith the'y surfacing of the roll ers for better application of glue. It is the principal object of the present inven pattern for glue spreading rollers,'formed by a novel arrangement or relationship of grooves that may be ground, cut or moldedin theA roller surface, whereby to insure, through their use, a better glued connection between the layers or plys of wood, both from the standpoint of holdingv efficiency and` noi? water-tightness of the seams or joints between plys.

tion to provide 'a novel and'improved surface More specifically stated, the objects of the.y

present invention reside in the provision of a glue applying lroller having a surface pattern that is formed bythe crossing of spirally directed, oppositely inclined series of vequally spaced, parallel grooves, setting off diamond v shaped panels, or areas, that will result in` a moreeven distribution-'of glue over a surface with which the roller has functional contact. and in such manneras to insure the sealing of joints or seams between the layers of plywood against any possible inlet of moisture, particularly along the edges of the plywood panel, or

the panel in pieces.

Explanatory to the present invention, it will here be mentioned that the desirability of having grooves in such rollers' is well recognized, and it has been customary, in the past, to probe v the pplication of glue toits opposite surfaces.

'I'herollers I andi, in this case, are partially A along any edge that may be formed by cutting vide such rollers withA longitudinal grooves which, incident to the roller having 'rolling contact with a wood panel, deposited distinct lines of glue across the'panel at intervals corresponding to the spacing of the grooves. Also. such rollers have-been 4made Ahaving encircling glue pick-up grooves, whichlikewise laid a-pattern of lines of glue-longitudinally or diagonallyon the wood panels. i t

The principal objection to either, or both of the above mentioned methods of grooving the rollers resides in the fact that the plywood panels of material so glued arevquite apt, if subjected to water or moisture, to absorb or admit water along the edges ofl the panel between .the lines of applied glue, and, this results in quick deterioration y of the panel.

In view of the above and other disadvantages,

the design of the present slue' roller pattern has 55 been maclev such as to provide. a glued connecj tion between plys of material that insures that a plywood panel will be sealed effectively about its outer edges and the same sealingl effect will be provided about theA edges of smaller-pieces that might be formed bythe dividing 'of the original panel.

In'accomplishlng the above stated, and other objects of the invention, I havel provided the improved details of construction," the preferred lforms of which are illustrated in the accompanyins dra ing, whereini Fis. 1 is plying machine, equipped with rollers embodying the present invention.

Fig. 2 is a view of a part of-a glue applying roller diagrammatically indicating the grooving pattern thereon.

-Fig. 3 is a detailed lview of a section of the grooving pattern. v i

Fig. 4 indicates the gine vpattern as laid'on a .wood panel by the rollers'.v L

Referring .more in'detail to the drawingi and '2, respectively, designate a pairof glue\y 1 applying rollers, mounted on parallel axes.'and

between which a -strip, sheet or ply of wood l is advanced, as indicated by the arrows,.for

contained in glue pots I. and glue. indicated at i, is picked up on their surfaces from the pots and then partly wiped therefrom, to leave a nlm of predetermined thickness, by rollers i and l, which are mounted parallel with and slightly spaced from .the vsurfaces of the glue rollers, as illustrated. This machine is merely illustrative of one'of various machines thatfmight be employed, and its arrangement oi'l partsvmight be altered to suit conditions. y

The feature of the present invention resides inthe particular pattern, or the surfaces of the glue rollers as formed by the particular arrangement of the grooving in their' lsurfaces.

As will be understood by reference to Fig. 2, the surface ofewch rol-ler is formed with two series of parallel, equally spaced spiral grooves; one series, designated by the lines that extend spirally of the roller in a right-hand turn, and the other series, designated by lines 9, extending spirally in the opposite direction, or in a lefthandtrn. The two series of grooves crosseaeh other at an obtuse angle. The result of the two series of grooves is to provide a surface pattern, shown lbest in Fig; 3, wherein the groovesAJ denne diamond shaped panels I l, in rows both side view of a partof a glue ap- Y encircling and extending lengthwise of the roller, and it is important also to note that the diamond shaped panels of adjacent longitudinal rows, and also of adjacent encircling rows intermesh with. or overlap each other, and thus there will be no bumping, bouncing or vibration due to the rolling contact of rollers with the wood ply.

In the present preferred form of construction, using a roller having a diameter of eight inches,

l the grooves in each series are square cut, located one-fourth inch apart, are one-tenth inch wide and thirty-five thousandths of an inch deep. and have a lead of six inches to each turn about the roller. These dimensions, however, might :he varied to suit conditions without departing from the spirit of the invention.

In use of rollers of this kind, the glue is picked up from the glue pots, then wiped off to the required film thickness -by the rollers B and 7, and is then transferred to the surface of the wood ply 3 in a pattern or patterns complemental to those of the rol-1ers, as will be understood by reference to Fig. 4. Onv rotation of a roller 4through the glue supply, each groove therein will -be filled with glue and there will be a thin film left over the surface of each diamond shaped area. The glue transfer to the wood ply or sheet with heavy areas of .glue as at Il where the lines of glue cross. The film of glue applied to the areas within the crossing lines acts to draw` and spread the lines of glue so that a Nery eiective glued connection between plys of wood will resuit.

The particular advantage in this glue pattern resides in the f-act that there are no open channels or passages defined between lines of glue,

" leaves a glue pattern or crossed lines I2 and IJ ious sizes and of various materials.' In the present instance, it has a surface layer oi' rubber laid on a metal core, with the grooves formed by a grinding operation. However, it is possible to mold the pattern either in rubber or to form it inmetal.

Having thus described my invention, what I claim as new therein and desire to secure by Letters Patent is:

1. In a glue applying machine, a glue container, a rotatably mounted glue transfer roller supported with a surface thereof in contact with glue in the container, and a glue wiping member operable in contact with the glue transfer roller for the removal of excess glue and to leave a film on the roller of pre-determined thickness, said tnansfer roller having a surface pattern formed by grooving in the roller, said grooving comprising two series of spaced, parallel, square-cut and relatively narrow channels, one series of channels extending spirally of the roller in a right hand turn, and the other series of channels extending spirally of the roller in a'left hand turn with the channels of the two steps crossing each other in a manner to define diamondshaped surfaces of substantial area that extend in rows lengthwise of and vencircling the roller.

2. In a glue applying machine, a glue container, a rotatably mounted glue transfer roller supported with a side surface thereof in contact with the glue in said container, and a wiping roller operable in contact with the glue transfer roller to remove excess glue, said transfer roller having a surface pattern formed by two series of spaced, parallel channels, one series of channels Vextending spirally of the roller in a right hand turn, and the other series of channels extending spirally of the roller in a. left hand turn, with the channels of the two series crossing each other at an obtuse angle and defining between them diamond-shaped areas that are approximately three times the width of the channels, and which extend in rows lengthwise of and encircling the roller.

' ELMER O. PEARSON. 

